The JLS boys have kicked off Marvin Humes’ epic eight-day stag do in true stag style by handcuffing him to a dwarf before taking him on a whirlwind tour of the city’s casinos.

Marvin Humes kicked off his stag do by being chained to a dwarf and forced to wear a bikini shirt (Picture: Xposure)

The 27-year-old is in Sin City with his bandmantes – Aston Merrygold, Jonathan ‘JB’ Gill and Oritsé Williams – and friends to celebrate his last few weeks of being single before he ties the knot to The Saturdays singer Rochelle Wiseman.

And the simple ingredients all stag dos’ need – sheer embarrassment, alcohol and lots of laughs – were all included in bulk as the lads began their first day of the Vegas leg of the holiday.

Marvin poses with his stags as they visit the sites of the strip (Picture: Xposure)

Stepping out wearing a t-shirt emblazoned with a bikini on a woman’s body – on the front and back – it was clear Marvin wasn’t completely comfortable not wearing his usual V-neck T-shirts as he laughed awkwardly.

But then the boys whipped out a pair of handcuffs and the groom-to-be was attached to a dwarf who he had to cart around with him during their visits to the city’s top casinos.

The dwarf, who proved to be a popular choice, goes by the name of 5 cent (Picture: Xposure)

5 Cent was booked from Tiny Entertainment

The dwarf, who goes by the name of 5 Cent and belongs to a company called ‘Tiny Entertainment’ promised to make Marvin his ‘b**ch’ for the day,

The boys then proceeded to get the party in full swing as they hopped from hotel casino to hotel to casino, no doubt enjoying a few drinks along the way.

The boys load up their private limo bus with stacks of beer (Picture: Xposure)

Splashing their cash, and adding a touch of luxury to their day, the boys even had their own private limo bus waiting on them hand-and-foot to whiz them from hotel to hotel.

Sassy: Marvin shows off his curves (Picture: Xposure)

It even came complete with a supply of beer in case they got thirsty in-between hotel visits.

The rest of JLS certainly seemed to be enjoying seeing Marvin in his feminine attire, chained to a dwarf, as they burst into giggles every time Marvin was made to pose for photos.

Later in the night, once Marvin had managed to have a change of outfit into a T-shirt not covered with a girl’s bikini, the boys hit the clubs.

And they just happened to bump into former heavyweight champion David Haye.

He then tweeted a picture of them posing in one of the many clubs, along with the caption: ‘Look who I just bumped into on my travels!!’

But despite being in the city famous for its casinos, clubs and bars, the boys made sure they took time out to top up their tans and have a splash in their hotel pool.

The boys pose with David Haye as they party into the night, Vegas style (Picture: Twitter)

They probably need a little relaxation given that the stag do, which will see the boys finish up in Miami, has been planned to run for eight days.

The boys touched down in Las Vegas on Monday, all wearing matching navy T-shirts with the slogan ‘Vegas Miami 05 2012’ printed on the back.

Aston cools down with a cocktail (Picture: Xposure)

The boys relaxed by their hotel pool (Picture: Xposure)

Meanwhile, while her groom has been partying, bride-to-be Rochelle has been busy trying to impress her in-laws with a home-cooked meal.

She wrote on Twitter last night: ‘Cooking a meal for my Mum tonight and my in laws, a bit of pressure as Pappa Humes is a Chef! Will report back, wish me luck :) x’

JLS arrived in Las Vegas ready to party in matching T-shirts (Picture: Splash)

And she added today: ‘My dinner went really well last night, and the great news is that no one has called yet saying they were sick :) woooo #winning.’

Rochelle, 23, also made it clear exactly what she though of her boyfriend’s new dwarf friend, writing earlier today: ‘I’m sure his new pal is nice but he can stay there ha x.’